Revert "update_payload: Add XZ compression support"

This reverts commit f1d6ceae.

Reason for revert: <canaries failing>

Original change's description:
> update_payload: Add XZ compression support
>
> This patch adds support for checking a payload that has REPLACE_XZ
> operations. REPLACE_XZ was added in minor version 3.
>
> BUG=chromium:758792
> TEST=unittests pass; paycheck.py with a xz generated payload pass;
> CQ-DEPEND=CL:823234
>
> Change-Id: If82c767a201b189e464f459d5c19485e5278d9b1
> Reviewed-on: https://chromium-review.googlesource.com/823227


> Commit-Ready: Amin Hassani <ahassani@chromium.org>
> Tested-by: Amin Hassani <ahassani@chromium.org>
> Reviewed-by: Ben Chan <benchan@chromium.org>
> Reviewed-by: Sen Jiang <senj@chromium.org>

TBR=benchan@chromium.org,senj@chromium.org,ahassani@chromium.org

Change-Id: I931ff3be081a41fe5fceef0e049ba4165c6acb49
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:795313
Reviewed-on: https://chromium-review.googlesource.com/830054


Commit-Ready: Amin Hassani <ahassani@chromium.org>
Tested-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Amin Hassani <ahassani@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>